#include <stdexcept>
#include <iostream>
#include <memory>
#include <chrono>
#include <thread>
#include <cstdint>
#include <vector>
#include <evhttp.h>
int main()
{
char const SrvAddress[] = "127.0.0.1";
std::uint16_t const SrvPort = 5555;
int const SrvThreadCount = 4;
try
{
void (*OnRequest)(evhttp_request *, void *) = [] (evhttp_request *req, void *)
{
auto *OutBuf = evhttp_request_get_output_buffer(req);
if (!OutBuf)
return;
evbuffer_add_printf(OutBuf, "<html><body><center><h1>Hello World!</h1></center></body></html>");
evhttp_send_reply(req, HTTP_OK, "", OutBuf);
};
std::exception_ptr InitExcept;
bool volatile IsRun = true;
evutil_socket_t Socket = -1;
auto ThreadFunc = [&] ()
{
try
{
std::unique_ptr<event_base, decltype(&event_base_free)> EventBase(event_base_new(), &event_base_free);
if (!EventBase)
throw std::runtime_error("Failed to create new base_event.");
std::unique_ptr<evhttp, decltype(&evhttp_free)> EvHttp(evhttp_new(EventBase.get()), &evhttp_free);
if (!EvHttp)
throw std::runtime_error("Failed to create new evhttp.");
evhttp_set_gencb(EvHttp.get(), OnRequest, nullptr);
if (Socket == -1)
{
auto *BoundSock = evhttp_bind_socket_with_handle(EvHttp.get(), SrvAddress, SrvPort);
if (!BoundSock)
throw std::runtime_error("Failed to bind server socket.");
if ((Socket = evhttp_bound_socket_get_fd(BoundSock)) == -1)
throw std::runtime_error("Failed to get server socket for next instance.");
}
else
{
if (evhttp_accept_socket(EvHttp.get(), Socket) == -1)
throw std::runtime_error("Failed to bind server socket for new instance.");
}
for ( ; IsRun ; )
{
event_base_loop(EventBase.get(), EVLOOP_NONBLOCK);
std::this_thread::sleep_for(std::chrono::milliseconds(10));
}
}
catch (...)
{
InitExcept = std::current_exception();
}
};
auto ThreadDeleter = [&] (std::thread *t) { IsRun = false; t->join(); delete t; };
typedef std::unique_ptr<std::thread, decltype(ThreadDeleter)> ThreadPtr;
typedef std::vector<ThreadPtr> ThreadPool;
ThreadPool Threads;
for (int i = 0 ; i < SrvThreadCount ; ++i)
{
ThreadPtr Thread(new std::thread(ThreadFunc), ThreadDeleter);
std::this_thread::sleep_for(std::chrono::milliseconds(500));
if (InitExcept != std::exception_ptr())
{
IsRun = false;
std::rethrow_exception(InitExcept);
}
Threads.push_back(std::move(Thread));
}
std::cout << "Press Enter fot quit." << std::endl;
std::cin.get();
IsRun = false;
}
catch (std::exception const &e)
{
std::cerr << "Error: " << e.what() << std::endl;
}
return 0;
}
I am using Libevent Library for HTTP server in C++. multithread example i have tried but it fails if thread count is 4 and request hitting from Jmeter are more than 4 suppose 8. first four request are handled by different threads but after four requests all the requests are handled by 1st thread. Any help would be appreciated
What I have tried:
Github examples of Linux code. Didn't get anything related to Windows
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